here we try to guess the value of a pointer -- LLVM says we cannot guess it and GCC suspects we canhttps://godbolt.org/g/SFLwz4
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There may be an argument that using an invalid pointer as an operand to == invokes UB, but ops on uintptr_t are all 100% well-defined.
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In that case they're probably both doing LOTS of wrong optimizations of stuff involving uintptr_t...
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yes we have test cases that both GCC and LLVM break
End of conversation
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